[R] Quick GREP challenge

[Gabor Grothendieck]

On Thu, Aug 26, 2010 at 6:16 AM, Dimitri Shvorob
<dimitri.shvorob at gmail.com> wrote:
>
>> grep("f[0-9]+=", "f1=5,f22=3,", value = T)
> [1] "f1=5,f22=3,"
>
> How do I make the line output c("f1", "f22") instead? (Actually, c(1,22)
> would be even better).
>

strapply in gsubfn extracts matches based on content rather than
delimiters.  See home page for more info http://gsubfn.googlecode.com

> library(gsubfn)
> x <- "f1=5,f22=3,"
> strapply(x, "f\\d+")[[1]]
[1] "f1"  "f22"

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